Our investigation shows that improper packing caused damage. Therefore we have to refer this matter to you.

我方检验证明，货物受损是由于包装不当而造成的。因此，我们不得不将此事提交。

youdao

Brown: But the fact is that 15 cases were damaged. And our investigation shows that improper packing caused the damage.

布朗：但实际情况是有15箱货已经损坏。而且我们的调查显示损坏是由于包装不当引起的。

youdao